Electronic appliance

Abstract

The invention provides an electronic appliance wherein a detection output of a sensor means is not influenced by a high frequency component originating in external radio waves. The electronic appliance comprises a conductor member located in a spaced relationship by a predetermined distance from a base which constitutes a body case together with a housing. A by-pass route is provided for by-passing a sensor means near the conductor member to introduce a high frequency component of electric current flow induced in the conductor member to the base. A distributed capacitance forming means is interposed in the by-pass route. Thus, a high frequency component of electric current flow induced in the conductor member is released to the body case via the by-pass route.

What is claimed is: 
     
       1. An electronic appliance, comprising: a conductor member located in a spaced relationship by a predetermined distance from a base which constitutes a body case together with a housing mounted on said base;   a sensor means located near said conductor member;   a by-pass route for by-passing said sensor means to introduce a high frequency component of electric current flow induced in said conductor member by electromagnetic waves to said body case; and   a distributed capacitance forming means interposed in said by-pass route.   
     
     
       2. An electronic appliance according to claim 1, wherein an amplifier for amplifying an output signal of said sensor means is located such that it may be covered by said scale plate frame. 
     
     
       3. An electronic appliance according to claim 1 wherein said by-pass route is formed by a metal plate having one end secured to said movable portion of said load cell and having an opposing wall formed in an opposing spaced relationship by a predetermined distance from said base at the other end thereof which extends downwardly along said movable portion of said load cell, said distributed capacitance forming means being formed by and between said opposing wall of said metal plate and said base. 
     
     
       4. An electronic appliance according to claim 3, wherein said metal plate is held between said load cell and said scale plate frame so as to secure said metal plate to an upper face of said load cell. 
     
     
       5. An electronic appliance according to claim 3, wherein said metal plate is secured to a lower face of said load cell. 
     
     
       6. An electronic appliance according to claim 1, wherein said by-pass route is formed by a metal plate having one end secured to said movable portion of said load cell and having an opposing wall formed in an opposing spaced relationship by a predetermined distance from an inside wall of said housing at the other end thereof which extends in a horizontal direction from said movable portion of said load cell, said distributed capacitance forming means being formed by and between said opposing wall of said metal plate and said housing. 
     
     
       7. An electronic applicance according to claim 6, wherein said metal plate is held between said load cell and said scale plate frame so as to secure said metal plate to an upper face of said load cell. 
     
     
       8. An electronic appliance according to claim 6, wherein said metal plate is secured to a lower face of said load cell. 
     
     
       9. An electronic appliance according to claim 1, wherein said by-pass route is formed by a metal plate having one end secured to one of said fixed and movable portions of said load cell and having an opposing wall formed at the other end thereof and opposed in a spaced relationship by a predetermined distance to the other of said fixed and movable portions of said load cell, said distributed capacitance forming means being formed by opposing portions of said metal plate and the other of said fixed and movable portions of said load cell, said metal plate being shaped so as not to interfere with said distortion yielding portion of said load cell. 
     
     
       10. An electronic appliance according to claim 9, wherein a fixed portion of said metal plate is held between said movable portion of said load cell and said scale plate frame so as to secure said metal plate to an upper face of said load cell. 
     
     
       11. An electronic appliance according to claim 1, wherein said by-pass route is formed by a metal plate secured to said base and opposed in a spaced relationship by a predetermined distance to said movable portion of said load cell, said distributed capacitance forming means being formed by opposing portions of said metal plate and said movable portion of said load cell. 
     
     
       12. An electronic appliance according to claim 11, wherein said metal plate is so shaped that it may oppose to three vertical faces of said movable portion of said load cell. 
     
     
       13. An electronic appliance according to claim 1, wherein said distributed capacitance forming means is formed by a through type capacitor. 
     
     
       14. An electronic appliance according to claim 13, wherein said through type capacitor is mounted at an end of a metal plate which is secured at the other end thereof to said movable portion of said load cell and extends downwardly along said movable portion, and said through type capacitor is loosely fitted for movement along a metal bar which is erected uprightly on said base. 
     
     
       15. An electronic appliance according to claim 14, wherein said metal plate is held between said movable portion of said load cell and said scale plate frame so as to secure said metal plate to an upper face of said load cell. 
     
     
       16. An electronic appliance according to claim 13, wherein said through type capacitor is mounted at an end of a metal plate which is secured at the other end thereof to one of said fixed and movable portions of said load cell and extends toward the other of said fixed and movable portions of said load cell in such a profile that said metal plate may not interfere with said distortion yielding portion of said load cell, and said through type capacitor is loosely fitted for movement along a metal bar which is erected uprightly on an upper face of said load cell. 
     
     
       17. An electronic appliance according to claim 16, wherein said metal plate is held between said movable portion of said load cell and said scale plate frame so as to secure said metal plate to an upper face of said load cell. 
     
     
       18. An electronic appliance according to claim 1, wherein said by-pass route is formed by a metal plate secured to said base and opposed in a spaced relationship by a predetermined distance to said scale plate frame, said distributed capacitance forming means being formed by and between opposing portions of said metal plate and said scale plate frame. 
     
     
       19. An electronic appliance according to claim 18, wherein said distributed capacitance forming means is formed at a location remote from the location of said load cell on said base with respect to said movable portion of said load cell. 
     
     
       20. A load cell weighing instrument, comprising: a load cell having at one end thereof a fixed portion secured to a base which constitutes a body case together with a housing mounted on said base, said load cell having at the other end thereof a movable portion at which a load is to be applied to said load cell, said load cell further having between said movable portion and said fixed portion thereof a distortion yielding portion at which said load cell is deformed by a load applied to said movable portion thereof, said load cell having a strain gauge located at said distortion yielding portion thereof for delivering a magnitude of deformation of said distortion yielding portion as an electric signal;   a scale plate frame secured to said movable portion of said load cell and having a scale plate placed thereon;   a by-pass route for electrically interconnecting said scale plate frame and said body case to by-pass said distortion yielding portion of said load cell to introduce electric current flow induced in said scale plate frame by electromagnetic waves to said body case; and   a piece of thin metal foil interposed in said by-pass route.   
     
     
       21. A load cell weighing instrument according to claim 20, wherein a metal plate is secured at one end thereof to said movable portion of said load cell and extends downwardly along said movable portion of said load cell with the other end thereof connected to said base via said piece of metal foil. 
     
     
       22. A load cell weighing instrument according to claim 21, wherein said metal plate is held between said movable portion of said load cell and said scale plate frame so as to secure said metal plate to an upper face of said load cell. 
     
     
       23. A load cell weighing instrument according to claim 20, wherein said piece of metal foil connected to said load cell is connected to an end of a metal plate which is secured at the other end thereof to one of said fixed and movable portions of said load cell and extends toward the other of said fixed and movable portions of said load cell in such a profile that said metal plate may not interfere with said distortion yielding portion of said load cell. 
     
     
       24. A load cell weighing instrument according to claim 23, wherein said metal plate is held between said movable portion of said load cell and said scale plate frame so as to secure said metal plate to an upper face of said load cell. 
     
     
       25. A load cell weighing instrument according to claim 20, wherein a metal plate which is secured at one end thereof to said movable portion of said load cell and extends substantially in a horizontal direction from said movable portion of said load cell is connected at the other end thereof to an inside wall of said housing via said piece of metal foil. 
     
     
       26. A load cell weighing instrument according to claim 25, wherein said metal plate is held between said movable portion of said load cell and said scale plate frame so as to secure said metal plate to an upper face of said load cell.